"Parameter
calculation" tabbed dialog
is a kind of small calculator for aquifer
parameters. Such ones as
leakage factor, hydraulic diffusivity, transmissivity, retardation
coefficient (for pumping near river) and piezometer shape factor
can be calculated here. The latter parameter is used not only for
calculations but also for defining the piezometer position that
will be then important for some solutions taking into account
storage capacity of the piezometer (see Moench’s solutions for
confined and unconfined aquifer).
Leakage factor
Leakage factor calculation dialog.
Equations for
leakage factor calculation:

one
aqiutard


two aqiutards –
double prime relates to the parameters of the second
aquitard

Hydraulic diffusivity
Hydraulic diffusivity
calculation dialog.
Equation for
calculating hydraulic diffusivity:
storage
coefficient:
In this dialog
parameters are automatically intercalculated.
Retardation coefficient
Retardation coefficient
calculation dialog.
Equation for
retardation coefficient calculation (in Shestakov’s
solution):
Equation for
retardation coefficient calculation (in Hantush’s
solution):
Where
T
 aquifer
transmissivity, m2/day;
k
 aquifer
hydraulic conductivity, m/day;
k'
 hydraulic
conductivity of the river bed, m/day;
m'
 river bed
thickness, m;
b
 river width,
m.
Shape factor
Shape factor
calculation dialog.
This tab allows
to choose the piezometer configuration necessary for solutions
accounting for piezometer storage capacity (see Moench’s solutions
for confined and unconfined aquifer with account for both
piezometer and pumping well storage capacity). Furthermore, the
user can estimate the shape factor value at given well radius,
screen length, aquifer thickness (or initial water saturated
thickness of unconfined aquifer), anisotropy and piezometer
configuration.
"Modified"
option calculates the shape factor used in Moench’s solution: shape
factor divided by 2π
